package com.hmdp.service.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Autowired
    private ShopTypeMapper shopTypeMapper;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public List<ShopType> queryTypeList() {
        // 将list存入缓存中
        String cacheListKey = RedisConstants.CACHE_SHOP_KEY + "list";
        String cacheListStr = stringRedisTemplate.opsForValue().get(cacheListKey);
        if(StrUtil.isNotBlank(cacheListStr)){
            // JSON字符串转换为List<ShopType>
            List<ShopType> list = JSONUtil.toList(cacheListStr, ShopType.class);
            return list;
        }
        List<ShopType> shopList = shopTypeMapper.selectList(null);
        if (shopList ==  null){
            stringRedisTemplate.opsForValue().set(cacheListKey, "", RedisConstants.CACHE_NULL_TTL, TimeUnit.MINUTES);
        }else {
            stringRedisTemplate.opsForValue().set(cacheListKey, JSONUtil.toJsonStr(shopList), RedisConstants.CACHE_SHOP_TTL, TimeUnit.MINUTES);
        }

        return shopList;
    }
}
